Preparation of 3-bromo-2-hydroxy-4,4,5,5-tetramethylcyclopenta-2

Details Preparation of 3-bromo-2-hydroxy-4,4,5,5-tetramethylcyclopenta-2 Preparation of 3-bromo-2-hydroxy-4,4,5,5-tetramethylcyclopenta-2

1978-09-01

1980-03-25

Morgenstern, Norman

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260586R, 260593H, C07C 4500

Patent

active

041950380

ABSTRACT:
Bromination of large batches of 2,6-dimethyl-2,5-heptadiene-4-one below -20.degree. C. followed by dehydrobromination without intermediate isolation and recrystallization to produce 3,5-dibromo-2,6-dimethyl-2,5-heptadiene-4-one which can be cyclized without isolation to high yields of 3-bromo-2-hydroxy-4,4,5,5-tetramethylcyclopenta-2-enone is disclosed.

REFERENCES:
patent: 3180893 (1965-04-01), Robinson et al.
patent: 3615440 (1971-10-01), Bloom et al.
Francis et al., "J. Chem. Soc.", vol. 1913, 2238 (1913).
Hesse et al., "Ann.", vol. 679, p. 100 (1964).
Claisen, "Ann. der Chemie", vol. 180, pp. 10-14 (1875).
Shoppee et al., "J. Chem. Soc. (c)", 1969, 1346-1349 (1969).
Francis et al., "J. Chem. Soc.", 1913, 2238.
Ingold et al., "J. Chem. Soc.", 1928, 365.

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