| 摘要 |
<p>A method of cyclization of α,φ-diynes with a transition metal catalyst such as niobium or tantalum salts such as halogen to yield products such as dimers, trimers and higher polymers which may have benzocyclobutene groups, or none of these, depending on the size of n in the α,φ-diynes of the formula HC=C(CH2)nC=C-H.</p> |
