Phosphaalkyne cyclodimerization at a rhodium(I) centre. Syntheses of a cationic η4-1,3-diphosphacyclobutadiene rhodium complex and of its platinum(II) or tungsten(0) adducts
Phosphaalkyne cyclodimerization at a rhodium(I) centre. Syntheses of a cationic η4-1,3-diphosphacyclobutadiene rhodium complex and of its platinum(II) or tungsten(0) adducts