Search Results:　 1-7 of 7

1

Copolymerization of 2-Bromomaleic Anhydride with Styrene and Its Dehydrobromination

TAGUCHI Hiroyuki , OGAWA Naotake , SATO Takatoshi

… The copolymerization followed the generalized mechanism for alternating copolymerization, and an alternating copolymer was obtained over a relatively wide feed composition range. … The dehydrobromination was completed by heating at 190℃ for 1 h. …

Chemical & pharmaceutical bulletin 45(9), 1515-1517, 1997-09-15

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2

(Hydroxyalkyl)pyridines as bifunctional catalysts. Dehydrobromination of 7-bromocholesterol.

Tachibana Yoji

… In the dehydrobromination of 7-bromocholesterol, the reactions catalyzed by 2- and 3-(hydroxyalkyl)pyridines afforded 5,7-diene and 4,6-diene as the main product, respectively. … The results have been interpreted in terms of a concerted mechanism through a cyclic intermediate. …

Bulletin of the Chemical Society of Japan 51(10), 3085-3086, 1978

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3

Studies on Terpenoids and Related Alicyclic Compounds. III. Bromination-Dehydrobromination of 2-Oxo-5α-santanolide

YAMAKAWA KOJI , NISHITANI KIYOSHI , NAGAKURA ETUKO , KIDOKORO SHINPEI , SAKAGUCHI REIJI

… Dehydrobromination of II gave an enone (VI), whose treatment with ethanolic hydrochloric acid afforded an equilibrium mixture of VI and VII. … Dehydrobromination of dibromoketones (IV and V) under several conditions gave a mixture of IX-XII, and XIV-XV, and their structures were confirmed from their spectroscopic data. … A mechanism of the bromination of I, and dehydrobromination of IV and V are discussed. …

Chemical & pharmaceutical bulletin 25(3), 385-396, 1977-03-25

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4

Studies on Terpenoids and Related Alicyclic Compounds. II. Bromination-Dehydrobromination of 2-Oxo-5β-santanolide

YAMAKAWA KOJI , NISHITANI KIYOSHI

… Mono-and di-bromination of 2-oxo-5β-santanolide (I), and dehydrobromination of the bromoketones were carried out. … Dehydrobromination of dibromoketones (VII and VIII) under several conditions gave a mixture of XII to XVIII. … A mechanism of dehydrobromination of VII and VIII is discussed. …

Chemical & pharmaceutical bulletin 25(3), 371-384, 1977-03-25

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5

Photolysis in rigid matrixes at low temperatures. An intermediate of photo-dehydrobromination.

Hirayama Satoshi

… The intermediate of the photo-dehydrobromination of 9-(α-bromopropionyl)anthracene (I) to yield 9-anthryl vinyl ketone (IV) was detected by its electronic spectrum upon photolysis in polar solvent matrixes at 77 K. … a concerted mechanism is postulated for the intermediate. …

Bulletin of the Chemical Society of Japan 50(2), 491-496, 1977

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6

The Catalytic Dehydrohalogenation of Haloethanes on Solid Acids and Bases

Mochida Isao , Anju Yasuhide , Yamamoto Hiroko , Kato Akio , Seiyama Tetsuro

… The elimination reactions of haloethanes and halopropanes on solid acids and bases, including a series of metal sulfates supported by silica gel, were studied at 300°C by means of the pulse technique in order to clarify the mechanism of the catalytic dehydrohalogenation. … Generally speaking, the rates of the dehydrochlorination from chloroalkanes were nearly equal to those of the dehydrobromination from bromoalkanes on the solid acids, but the latter were larger than the former on solid bases. …

Bulletin of the Chemical Society of Japan 44(12), 3305-3310, 1971

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7

Studies on the Syntheses of the Aliphatic Diamines. VIII:The Ring Opening Reaction by Hydrogen Bromide of 3-(2-Tetra hydrofuryl) Propanol and its Derivatives.

KIMURA Goro , YAMAMOTO Kosuke , NIWA Michio

… Although 1, 4, 7-TBH is stable at a temperature below 130°c, heating of 1, 4, 7-TBH at 150-200°c without catalyst caused a selective dehydrobromination of secondary bromine and gave above 97% of 1, 7-DBH. … However, dehydrobromination reaction of 1, 4, 7-TBH by alkali showed no selectivity between the primary and secondary bromine and yielded about 30% of 1, 7-DBH. … The reaction mechanism of formation of 1, 7-DBH and 1, 4, 7-TBH has been discussed with these results. …

Journal of Synthetic Organic Chemistry, Japan 22(11), 936-943, 1964

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