2-Ethoxy-2,4-pentadiene

On the other hand, l-ethoxy-l,3-pentadiene (44a) and l-(trimethylsilyloxy)-1,3-pentadiene (44b), as mixtures of four isomers, gave low yields of 45a and 45b [16], respectively, besides a complex mixture of products including cis and tram-46, head-to-head dimers of 4 [7a, 17] (see Sect. 4.1.1) (Scheme 9). 

Reaction of 2-cyanomethyl-4H-l,3-benzothiazin-4-one with benzoylace-tonitrile at 160°C yielded 8-cyano-7-imino-9-phenyl-7//,ll//-pyrido[2,l-6][l,3]benzothiazin-l 1-one (85MI1 86MI2). Reaction of 2-ethoxy-2,3 dihydro-4//-l,3-benzothiazin-4-one with 1,2,3,4-tetramethylbutadiene and 2,4-dimethyl-l,3-pentadiene in the presence of boron trifluoride in diethyl ether gave rise to 6,7,8,9-tetramethyl- and 7,9)9-trimethyl-5a,6,9,ll-tetrahydropyrido[2,l-6][l,3]benzothiazin-ll-one, respectively (73JHC149). 

Hydroxy-4-methoxy-4-methyl-l-trimethylsilyl- E21b, 1213 [R-CHO -> R-CH(OH)-C(OR)(CH3) — C4H9] 1,2-Pentadien l-(l-Ethoxy-ethoxy)-4-methyl-l-trimethylsilyl- El 5/3, 3003 [En-H - En-CH(CH3)2] Peroxid (1,1-Dimethyl-propyl)-(1,1 -dimethyl-3-trimethylsilyl-2-propinyl)- E13/1, 360 (OH - O-OR)... 

Methoxy-l,2-nonad1ene, 38 - (22) 3-Methoxy-3,4-pentadien- -l-ol, 39 - (23) 3-Hethoxy-4-ethoxy-l,2-butadiene, 40 - 14) 3-Methoxy--4-ethoxy-l,2-pentadiene, 40 - IS) 1-Triraethylsilyl-l-methoxyallene,... 

Hethoxy-l-methylthioallene, 42 - (27) Carbinols derived from methoxyallene, 43 - 18) 1-Iodo-l-methoxyallene, 44 - (29) 3-Methyl--l-tert.-butoxy-l,2-pentadiene, 44 - (20) 4-Ethoxy-l,2,3-pentatriene,... 

Ethyl-4-methyl-l,2,4-pentatriene, 165 - (33) l-Ethoxy-1,2--heptadiene, 166 - (34)3-Hethyl-l-ethoxy-l,2-pentadiene, 167 - (35)... 

Ethoxy-4,4-diroethyl-l,2-pentadiene, 167 - (35) 3,4-Di-tert.-butyl--1,2,4,5-hexatetraene, 168 - (37) 3-Tr1raethylsilyl-l,2-heptadiene, 169... 

Reaction Using 2-Ethoxy-3-methylene-1,4-pentadiene and 2-(2-Bromo-l-ethoxyethyl) 1,3-butadiene. 1985,... 

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