1) Journal of the American Chemical Society
1949, 71 (5), pp 1870–1871
Metalation of Thiophene by n-Butyllithium
Henry. Gilman, David A. Shirley
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http://dx.doi.org/10.1021/ja01173a510
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