Browsing by Author "WU, HJ"

Now showing 1 - 19 of 19

3-SUBSTITUTED 2-CYCLOPENTENONES FROM CYCLOPENTADIENES
(1993-12-01)
LIN, CC
;
HSIA, KS
;
WU, HJ
;
應用化學系
;
Department of Applied Chemistry
Oxidation of cyclopentadienes 1a-1j, which were prepared by alkylation of cyclopentadienyl anion with the corresponding alkyl bromides, with pyridinium chlorochromate (PCC) gave the 2-cyclopentenones 2a-2j respectively in 10-15% yields. Reaction of 3 and 5 with PCC gave the spiro compounds 4 and 6 respectively in 75-80% yields.
A NEW EXPERIMENTAL-METHOD TO DETERMINE THE SATURATION VOLTAGE OF A SMALL-GEOMETRY MOSFET
(1988-09-01)
JANG, WY
;
WU, CY
;
WU, HJ
;
電控工程研究所
;
Institute of Electrical and Control Engineering
A TANDEM OXIDATION INTRAMOLECULAR DIELS-ALDER REACTION
(1987-06-15)
WU, HJ
;
KAI, P
;
交大名義發表
;
應用化學系
;
National Chiao Tung University
AN UNPRECEDENTED OXIDATION REACTION OF CYCLOPENTADIENE DERIVATIVES BY PYRIDINIUM CHLOROCHROMATE
(1988-06-01)
WU, HJ
;
PAN, K
;
HSIA, KS
;
LIU, WC
;
交大名義發表
EFFECT OF POLY-SI GETTERING SCHEME ON THE QUALITY OF SI EPITAXIAL FILM
(1981)
CHEN, MC
;
LEE, JY
;
WU, HJ
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
FORMATION OF TETRAACETAL OXA-CAGES AND CONVEX OXA-CAGES ON OZONOLYSIS OF BICYCLO[2.2.2]OCTENES
(1995-10-01)
LIN, CC
;
WU, HJ
;
應用化學系
;
Department of Applied Chemistry
Tetraacetal oxa-cage compounds 5a and 5b and convex era-cage compounds 7a and 8a are synthesized in a short sequence. Ozonolysis of endo adducts 2a and 2b in dichloromethane at -78 degrees C followed by reduction with dimethylsulfide gave tetraacetal era-cages 5a and 5b in 35 % yields respectively. Ozonolysis of 2a in dichloromethane at -78 degrees C followed by treatment with triethylamine gave the convex era-cage 7a in 34% yield. These results support an acid-base proton transfer between the final ozonides and the base. The reasons that these era-cage compounds formed in low yields are discussed. The synthesis of tetraacetal oxa-cage 14, possessing aromatic substitutents directly on the skeleton of the era-cage, is accomplished.
FORMATION OF TETRAACETAL OXA-CAGES AND CONVEX OXA-CAGES ON OZONOLYSIS OF BICYCLO[2.2.2]OCTENES
(1995-10-01)
LIN, CC
;
WU, HJ
;
交大名義發表
;
應用化學系
;
National Chiao Tung University
Tetraacetal oxa-cage compounds 5a and 5b and convex era-cage compounds 7a and 8a are synthesized in a short sequence. Ozonolysis of endo adducts 2a and 2b in dichloromethane at -78 degrees C followed by reduction with dimethylsulfide gave tetraacetal era-cages 5a and 5b in 35 % yields respectively. Ozonolysis of 2a in dichloromethane at -78 degrees C followed by treatment with triethylamine gave the convex era-cage 7a in 34% yield. These results support an acid-base proton transfer between the final ozonides and the base. The reasons that these era-cage compounds formed in low yields are discussed. The synthesis of tetraacetal oxa-cage 14, possessing aromatic substitutents directly on the skeleton of the era-cage, is accomplished.
GENERAL EXPERIMENTAL-METHOD OF PARAMETER EXTRACTION FOR CMOS TIMING MACROMODELS
(1988-04-01)
WU, CY
;
JANG, WY
;
WU, HJ
;
電控工程研究所
;
Institute of Electrical and Control Engineering
INTRAMOLECULAR DIELS-ALDER REACTION OF FURANS WITH ALLENYL ETHERS - HIGH EFFECT OF THE CHAIN-LENGTH ON THE STRUCTURE AND REACTIVITY OF THE CYCLOADDUCTS
(1994-07-01)
WU, HJ
;
LIN, SH
;
LIN, CC
;
交大名義發表
;
應用化學系
The structure and reactivity of the cycloadducts of the title reaction were found to be highly dependent on the chain length between the furan diene and the allenyl ether dienophile. Reaction of the propargyl ether (2) with t-BuOK in t-BuOH at 85-degrees-C for 3 h gave a mixture of the cycloadducts (3) and (4) in 90% yield, which were transferred to the benzo derivatives (5), (6) and (7). Treatment of the propargyl ether (8) with t-BuoK in t-BuOH at 85-degrees-C for 5 h gave the products (9) and (10) in a ratio of 8:1 in 65% yield, no detectable amount of the cycloadduct (8b) was obtained. Refluxing of the propargyl ether (13) with t-BuOK in t-BuOH at 85-degrees-C for 4 h gave the allenyl ether (14). Heating 14 in DMSO at 15-degrees-C for 12 h still did not give 15.
INTRAMOLECULAR DIELS-ALDER REACTION OF FURANS WITH ALLENYL ETHERS FOLLOWED BY METHYLTHIO GROUP 1,4-REARRANGEMENT
(1994-01-31)
WU, HJ
;
SHAO, WD
;
YING, FH
;
交大名義發表
;
應用化學系
The base-catalyzed intramolecular Diels-Alder reactions of the furfuryl propargyl ethers la-le gave compounds 6a-6e as the major product respectively, a novel reaction involving an intramolecular Diels-Alder reaction followed by a methylthio group 1,4-rearrangement.
INTRAMOLECULAR DIELS-ALDER REACTIONS OF FURANS WITH ALLENYL ETHERS - FORMATION OF INDANONE AND TETRALONE
(1991-12-01)
LIN, CC
;
CHEN, LH
;
WU, HJ
;
交大名義發表
;
應用化學系
The intramolecular Diels-Alder reactions of the furans 3, 11a and 11b produced indanone 6 and tetralones 14a and 14b respectively, presumably via the corresponding allenyl ethers 4, 12a and 12b and the intramolecular cycloadducts 5, 13a and 13b.
LQC/LTR CONTROL OF AN AC INDUCTION SERVO DRIVE
(1995-03-01)
TZOU, YY
;
WU, HJ
;
交大名義發表
;
電控工程研究所
;
National Chiao Tung University
A new design method based on the linear-quadratic-Gaussian with loop-transfer-recovery (LQG/LTR) theory has been developed for the design of high performance ac induction servo drives using microcomputer-based digital control, The principle of field orientation is employed to achieve the current decoupling control of an induction motor. An equivalent model representing the dynamics of the decoupled induction motor has been developed, Based on the developed model with specified parameter uncertainties and given performance specifications, a frequency domain loop-gain-shaping method based on the LQG/LTR theory is proposed for the design of the servo loop controller. A microcomputer-based induction servo drive has been constructed to verify the proposed control scheme. Simulation and experimental results are given to illustrate the effectiveness of the proposed design method.
MULTIMICROPROCESSOR-BASED ROBUST-CONTROL OF AN AC INDUCTION SERVO MOTOR
(1990-05-01)
TZOU, YY
;
WU, HJ
;
電控工程研究所
;
Institute of Electrical and Control Engineering
NOVEL HETEROCYCLIC CAGE COMPOUNDS FROM 2-METHYLTHIOFURANS
(1991-06-01)
WU, HJ
;
HUANG, FJ
;
LIN, CC
;
交大名義發表
;
應用化學系
Some novel heterocyclic cage compounds 1a-1c were synthesized from the corresponding 2-methylthiofurans 2a-2c in a short sequence.
NOVEL OXA-CAGE COMPOUNDS - SYNTHESIS, STRUCTURES, AND THE FORMATION MECHANISM OF TETRAACETAL OXA-CAGES AND CONVEX TETRAQUINANE OXA-CAGES
(1995-11-17)
WU, HJ
;
LIN, CC
;
交大名義發表
;
應用化學系
;
National Chiao Tung University
Several novel tetraacetal era-cage compounds 5a-d and convex tetraquinane era-cage compounds 16a-d and 17b-d are synthesized from alkylfurans in three steps. Ozonolysis of the cis-endo-1,4-diones 3a-d in dichloromethane at -78 degrees C followed by reduction with dimethyl sulfide gives the era-cages 5a-d in high yields, respectively. The structures of these new tetraacetal era-cages are deduced from their spectral data and proven for the first time by X-ray analysis of the crystalline compound 5a. Ozonolysis of 3a-d in dichloromethane at -78 degrees C followed by treatment with triethylamine gives the convex tetraquinane era-cages 16a-d and 17b-d in 85-90% yields, respectively. The structures of these novel convex tetraquinane era-cages are finally proven by X-ray analysis of the crystalline compound 16a. Two reaction mechanisms via the common final ozonides are proposed for the formation of these two different types of era-cage compounds. The structures of the final ozonides formed by ozonolysis of the norbornene derivatives 3 are deduced to be 9 with endo stereochemistry on the basis of their spectral data and the formation of these two types of era-cages from the final ozonides. In reaction with the final ozonides, triethylamine is found to act as a base instead of a reducing agent, a different function from that of dimethyl sulfide. The synthesis of era-cages 24 and 25, which possess aromatic substituents directly on the skeleton, has also been accomplished.
STUDY ON THE REACTION-MECHANISM OF THE BASE-CATALYZED INTRAMOLECULAR DIELS-ALDER REACTION OF FURFURYL PROPARGYL ETHERS
(1995-09-22)
WU, HJ
;
YING, FH
;
SHAO, WD
;
應用化學系
;
Department of Applied Chemistry
STUDY ON THE REACTION-MECHANISM OF THE BASE-CATALYZED INTRAMOLECULAR DIELS-ALDER REACTION OF FURFURYL PROPARGYL ETHERS
(1995-09-22)
WU, HJ
;
YING, FH
;
SHAO, WD
;
交大名義發表
;
應用化學系
SYNTHESIS OF FURANOID NATURAL-PRODUCTS
(1988-06-01)
LIU, WH
;
WU, HJ
;
交大名義發表
;
應用化學系
;
National Chiao Tung University
TRANSPUTER-BASED FULLY DIGITAL ADAPTIVE-CONTROL SYSTEM FOR HIGH-PERFORMANCE AC INDUCTION-MOTOR DRIVES
(1994)
WU, HJ
;
TSAI, MF
;
TZOU, YY
;
電控工程研究所
;
Institute of Electrical and Control Engineering