
TY  - JOUR
A1  - Dickson, RS 
A1  - Mok, C 
A1  - Connor, G 
T1  - The reactions of some diynes with (C<sub>5</sub>H<sub>5</sub>)Co(CO)<sub>2</sub> and Fe(CO)<sub>5</sub>: Inter- or Intra-molecular cyclizations?
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1977
VL  - 30
IS  - 10
SP  - 2143
EP  - 2151
KW  - 
UR  - https://doi.org/10.1071/CH9772143 
N2  - The reactions of several diynes MeC&#8801;C(CH2)nC&#8801;CMe, n = 2-4, with (&#951;- C5H5)Co(CO)2 and Fe(CO)5 have been compared. A p-benzoquinone complex, (&#951;-C5H5)Co[(C8H10)2(CO)2], and three isomers of the cyclopentadienone complex, (&#951;-C5H5)Co[(C8H10)2CO], are formed in the reaction of (&#951;- C5H5)Co(CO)2 with octa-2,6-diyne. In each complex, the ligand is formed by intermolecular cyclization of two diynes with inclusion of CO. The corresponding reactions with nona-2,7-diyne and deca-2,8-diyne give complexes (&#951;-C5H5)Co[(C9H12)CO] and (C5H5)Co[(C10H14)CO] in which a bicyclic cyclopentadienone has been formed by intramolecular condensation of the diyne. Intramolecular cyclization is also achieved when all three diynes are treated with Fe(CO)5. The reactions with octa- 2,6-diyne and deca-2,8-diyne give metallodiene complexes, Fe2(CO)6(diyne), in which the ferracyclopentadiene ring is fused to either a 4- or 6-membered ring. With nona-2,7-diyne, a cyclopentadienone complex of formula Fe(CO)3[(C10H14)CO] is isolated. In the reactions with Fe(CO)5,organic products of the type (diyne)2, (diyne)3 and [(diyne)CO]2 are also isolated. 
ER  -

