PubMed:20458386 JSONTXT

{"project":"LitCoin-PubTator-for-Tuning","denotations":[{"id":"2","span":{"begin":27,"end":34},"obj":"ChemicalEntity"},{"id":"3","span":{"begin":40,"end":44},"obj":"ChemicalEntity"},{"id":"10","span":{"begin":153,"end":171},"obj":"ChemicalEntity"},{"id":"11","span":{"begin":259,"end":266},"obj":"ChemicalEntity"},{"id":"12","span":{"begin":275,"end":300},"obj":"ChemicalEntity"},{"id":"13","span":{"begin":338,"end":344},"obj":"ChemicalEntity"},{"id":"14","span":{"begin":362,"end":367},"obj":"ChemicalEntity"},{"id":"15","span":{"begin":463,"end":472},"obj":"ChemicalEntity"}],"attributes":[{"id":"A2","pred":"tao:has_database_id","subj":"2","obj":"MESH:D000480"},{"id":"A11","pred":"tao:has_database_id","subj":"11","obj":"MESH:D000480"},{"id":"A13","pred":"tao:has_database_id","subj":"13","obj":"MESH:D000480"},{"id":"A14","pred":"tao:has_database_id","subj":"14","obj":"MESH:D008670"},{"id":"A15","pred":"tao:has_database_id","subj":"15","obj":"MESH:C044646"}],"text":"The [2+2] cycloaddition of alkynes at a Ru-P pi-bond.\nThe Ru[double bond, length as m-dash]P double bond in the 5-coordinate terminal phosphido complex [Ru(eta(5)-indenyl)(PR(2))(PPh(3))] undergoes regioselective [2+2] cycloaddition with simple and activated alkynes to give metallaphosphacyclobutene complexes. These unusual examples of alkyne insertion into a metal-heteroatom bond represent potentially important intermediates in stereoselective routes to new phosphine reagents and ligands."}