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M14
Received: 11 June 1997 / Published: 16 June 1997
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M15
Received: 16 June 1997 / Published: 20 June 1997
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M16
Received: 16 June 1997 / Published: 20 June 1997
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M17
Received: 16 June 1997 / Published: 20 June 1997
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M18
Received: 16 June 1997 / Published: 20 June 1997
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M19
Received: 18 June 1997 / Published: 20 June 1997
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M20
Received: 18 June 1997 / Published: 20 June 1997
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M21
Received: 18 June 1997 / Published: 20 June 1997
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M22
Received: 18 June 1997 / Published: 20 June 1997
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p. 87-90
Received: 10 January 1997 / Accepted: 4 April 1997 / Published: 10 June 1997
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| Download PDF Full-text (23 KB) Abstract: The aldehyde 7, derived from 10-undecenoic acid (5) on cis -selective Wittig reaction with pentylidenetriphenylphosphorane, subsequent deprotection and oxidation gave the pheromone (11Z)-hexadecenal (1). Wittig-Horner olefination of 1 with the phosphonate 9 furnished the conjugated ester 10 which on base catalyzed isomerization to the (3Z)-ester 11 followed by LAH reduction and acetylation gave (3Z,13Z)-octadeadien-1-yl acetate (2). Compound 10 on the other hand was chemoselectively reduced and acetylated to furnish the pheromone (2E,13Z)-octadeadien-1-yl acetate (4). For the synthesis of (3E,13Z)-octadeadien-1-yl acetate (3), 1 was condensed with malonic acid under modified condition to afford the acid 13 which was converted to 3 by standard reaction protocol.
p. 91-98
Received: 20 March 1997 / Accepted: 11 April 1997 / Published: 11 June 1997
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| Download PDF Full-text (45 KB) Abstract: A series of meso-chlorine substituted heptamethine-cyanine dyes and related heptamethine cyanine dyes unsubstituted on the vinyl chain were synthesized by condensation of 2,3,3-trimethyl indolenium salts with reactive intermediates, 2-chloro-formyl-3-hydroxy-methylenecyclohexene or N-[5-(phenylamino)-2,4-phentadienylidene] aniline monohydro-c hloride. The structures of the dyes were characterized by virtue of 1 HNMR, 13 C-NMR, IR, MS, etc. The reaction conditions and physicochemical properties of the dyes were extensively explored with classical photo-physical techniques
p. 99
Published: 30 June 1997
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