TY  - JOUR
AB  - 5-Bromo-1,2,3,4,5-pentamethylcyclopenta-1,3-diene, which is available in good yield from 1,2,3,4,5-pentamethylcyclopenta-1,3-diene, reacts with potassium tert-butoxide in the presence of catalytic amounts of 18-crown-6 under dehydrobromination to give 1,2,3,4-tetramethylfulvene (1,2,3,4-methyl-5-methylenecyclopenta-1, 3-diene, 1) in high yield. Compound 1 can be used to prepare various 1-functionalized 2,3,4,5-tetramethylcyclopentadiene systems. For example, reaction of lithium dimethylamide, allylmagnesium chloride, potassium indenide or 1,3-dithian-2-yllithium with 1 leads, after hydrolysis, to the corresponding substituted cyclopentadiene systems 3-6 in high yield.
DA  - 1992
DO  - 10.1055/s-1992-26313
LA  - ger
IS  - 11
M2  - 1096
PY  - 1992
SN  - 0039-7881
SP  - 1096-1098
T2  - Synthesis
TI  - Ein einfacher Weg zu 1,2,3,4-Tetramethylfulven und zu 1-funktionalisierten 2,3,4,5-Tetramethylcyclopentadienen
UR  - https://nbn-resolving.org/urn:nbn:de:0070-pub-17748170
Y2  - 2024-11-21T23:17:07
ER  -