Formation of [cyclic] [Ru[HN:C(Ph)OC:CHPh](CO)Cl[P(C6H4Me-p)3]2]. An anomalous insertion reaction of phenylacetylene with [Ru(CO)C1H(3,5-Me2Hpz)Ru(CO)C1H[P(C6H4Me-p)3]2] in ethanol/dichloromethane