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A Convenient New Synthesis of 4-Alkylidene-3,3,5,5-Tetramethyl-Δ1,2-Pyrazolines. Potential Precursors of T.M.M.

✍ Scribed by Richard J. Bushby; Michael D. Pollard

Publisher
Elsevier Science
Year
1977
Tongue
French
Weight
73 KB
Volume
18
Category
Article
ISSN
0040-4039

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✦ Synopsis

Probably the best precursors for T .M .M. biradicals (l and derivatives thereof) are the 4-alkylidene-A1 ' 2-pyrazolines first studied by Dowd 1 . Unfortunately the parent system 2 tends to undergo isomerisation1 ' 2 to give conjugated dienes, such as 3, and this may compete with the desired elimination of nitrogen .

Day3 has overcome this problem by working with the a-methylated systems 4 and Berson 4 by using the bicyclic systems 5 .

& 0

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