Syntheses and Properties of Trimethyltetradehydroannulenones and the Benzannelated Derivatives

DOI: 10.1039/P19810000947

Source and publish data:

Journal of the Chemical Society. Perkin transactions I p. 947 - 958 (1981)

Update date:2022-08-04

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Authors:

Ojima, Juero

Wada, Kazuyo

Kanazawa, Keiko

Nakagawa, Yukiko

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Article abstract of DOI:10.1039/P19810000947

Syntheses of 5,10,15- (8) and 2,5,10-trimethyl-6,7,8,9-tetradehydrocyclopentadecenone (12), and 8,13- (9) and 6,13-dimethyl-14,15,16,17-tetradehydrobenzocyclopentadecen-7-one (13), 8,13- (10) and 10,13-dimethyl-14,15,16,17-tetradehydrobenzocyclopentadecen-9-one (14), and 8-methyl- (11) and 6-methyl-16,17,18,19-tetradehydrodibenzocyclopentadecen-7-one (15) are described.The influence of α-methyl substitution and benzannelation upon the structure and tropicity of the tetradehydro<15>annulenone ring system is discussed in view of the 1H n.m.r. and u.v. spectra of these annulenones, as well as those of the α-methyl unsubstituted annulenones (4)-(7).

Full text of DOI:10.1039/P19810000947

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