. . "A novel approach to 6-alkynylpurines based on [2+2+2]-co-cyclotrimerization of 6-alkynylpurines with various alfa, omega-diynes is described. Co-cyclotrimerization is catalyzed by Ni- and Co-phosphine catalysts and their choice depends on the substitution pattern of the both reactants."@en . . "P(GA203/00/0036), P(GA203/01/0863), P(GA203/03/0035), Z(AV0Z4055905)" . . . "RIV/61388963:_____/03:57030073!RIV/2004/GA0/A57004/N" . "[2+2+2]-Co-cyclotrimerization 6-alkynylpurines with diynes: a method for preparation of 6-arylpurines." . "785;788" . "Hocek, Michal" . "C\u00EDsa\u0159ov\u00E1, I." . "Turek, P." . "[2+2+2]-Co-cyclotrimerization 6-alkynylpurines with diynes: a method for preparation of 6-arylpurines." . . "A novel approach to 6-alkynylpurines based on [2+2+2]-co-cyclotrimerization of 6-alkynylpurines with various alfa, omega-diynes is described. Co-cyclotrimerization is catalyzed by Ni- and Co-phosphine catalysts and their choice depends on the substitution pattern of the both reactants." . . . . "[2+2+2]-Co-cyclotrimerization 6-alkynylpurines with diynes: a method for preparation of 6-arylpurines."@en . "RIV/61388963:_____/03:57030073" . "1"^^ . . "4"^^ . "4"^^ . . "0"^^ . "0"^^ . "[6288566832B7]" . "0040-4039" . "Kotora, M." . . "44" . . . "GB - Spojen\u00E9 kr\u00E1lovstv\u00ED Velk\u00E9 Brit\u00E1nie a Severn\u00EDho Irska" . "4" . . "636787" . . "[2+2+2]-Co-cyclotrimerization 6-alkynylpurines with diynes: a method for preparation of 6-arylpurines."@en . . . "Tetrahedron Letters" . . "purines; nucleosides; cycloadditions"@en .