1) Journal of Organometallic Chemistry
Volume 2, Issue 4, October 1964, Pages 304-308
Competitive metalation of some nitrogen- and sulfur-containing heterocycles
David A. Shirley, John C. goan
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http://dx.doi.org/10.1016/S0022-328X(00)82215-9
Volume 28, Issue 48, 1987, Pages 6085-6088
2,3-Dimethylene-2,3-Dihydrothiophene: The thiophene analogue of ortho-xylylene
Derek J. Chadwick, Andrew Plant
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http://dx.doi.org/10.1016/S0040-4039(00)96870-9