1. GLASER C (1870) Justus Leibigs Ann Chem 154, 137; Chem Ber (1869) 2, 422
2. EGLINTON G, MCCRAE W ADV. (1963) In: Org Chem, Methods and Results, Vol. 4, Inter- science Publishers, New York
3. CADIOT P, CHODKIEWICZ W (1969) In: Viehe HG (ed) Chemistry of Acetylenes. Marcel Dekker, New York, p 597
4. HAY AS (1962) J Org Chem 27, 3320
5. EASTMOND R, JOHNSON TR, WALTON DRM (1974) Tetrahedron 28, 4601