Reversible protonation of the purple ruthenabenzofuran (or tethered ruthenacyclohexadiene) Ru[C 5 H 2 -(CO 2 Me-2)(CO 2 Me-4)(CHCO 2 Me-5)](CO)(PPh 3 ) 2 (1) with HBF 4 • OEt 2 gives the structurally characterized stable cationic tethered ruthenabenzene [Ru[C 5 H 2 (CO 2 Me-2)(CO 2 Me-4)(CH 2 CO 2 Me-5)](CO)(PPh 3 ) 2 ]-[(BF 4 ) 2 H] (2), while the thermal reaction of 1 with HCl forms the stable neutral tethered ruthenabenzene Ru[C 5 H 2 (CO 2 Me-2)(CO 2 Me-4)(CH 2 CO 2 Me-5)]Cl(PPh 3 ) 2 (3) as the major product. The cyclopentadienyl complex Ru(η 5 -C 5 H 2 (CH 2 CO 2 Me-1)(CO 2 Me-2)(CO 2 Me-4)Cl(CO)(PPh 3 ) (4), which is formed in this reaction as a minor product, can be separated from 3 by chromatography. Treatment of the ruthenabenzene 3 with CNR (R ) p-tolyl) gives the purple ruthenabenzofuran (or tethered ruthenacyclohexadiene) complex Ru[C 5 H 2 (CO 2 Me-2)(CO 2 Me-4)(CHCO 2 Me-5)](CNR)(PPh 3 ) 2 (5), which is the isocyanide analogue of 1.

No abstract

A cobalt(ir1) complex containing the tetradentate ligand edda and a bidentate diamine ligand which bears 3-chloropropyl groups on the nitrogen atoms undergoes efficient intramolecular alkylation in basic solution to form a complex containing the cyclam tetraaza macrocycle with two coordinated N-carboxymethyl pendant arms, characterised by an X-ray crystal structure of the perchlorate salt.

No abstract

Photochemically-induced decarboxylation of a cobalt(III) cyclam complex bearing two coordinated N-carboxymethyl pendant arms results in kinetic stabilisation of the resulting aminoalkyl three-membered Co-C-N ring, which has been characterised by an X-ray crystal structure determination.