트리플 데카 착물에서부터 Alkynes의 고리화 반응

A Cyclization of Alkynes from Tripledecker Sandwichcomplexes

트리플 데카 착물, bis(${\eta}^5$-cyclopentadienyl)-${\mu}$-(${\eta}^6$-2,3-dialkyl-1,4-dimethyl-1,4-dibora-2,5-cyclohexadiene)dicobalt 1을 합성하고, 이것을 출발물질로 하여 여기에 3-hexyne을 과량으로 반응시켰더니 두 종류의 sandwich 착물인 cyclopentadienyl(${\eta}^6$-2,3-dialkyl-1,4-dimethyl-1,4-dibora-2,5-cyclohexadiene)cobalt 2와 cyclopentadienyl(${\eta}^6$-hexaethyl benzene)cobalt 3가 분리되었다. 착물 3은 실온에서 정제하는 동안 분해하여 3-hexyne의 고리화 반응 생성물인 hexaethyl benzene이 생성되었음을 확인하였다.

A tripledecker sandwichcomplex, bis(${\eta}^5$-cyclopentadienyl)-${\mu}$-(${\eta}^6$-2,3-dialkyl-1,4-dimethyl-1,4-dibora-2,5-cyclohexadiene)dicobalt 1 was synthesized as a starting material. By the reaction of compound 1 with the excess 3-hexyne two kinds of sandwichcomplexes, cyclopentadienyl(${\eta}^6$-2,3-dialkyl-1,4-dimethyl-1,4-dibora-2,5-cyclohexadiene)cobalt 2 and cyclopentadienyl(${\eta}^6$-hexaethyl benzene)cobalt 3 were separated. The complex 3 was decomposed during purifying at RT to give a cyclization product of 3-hexyne, hexaethyl benzene.