115889-91-3

Basic information

• Product Name: fac-(4-methyl-2,6,7-trioxa-1-phodphabicyclo{2.2.2}octane)-1,2-bis(diphenylphosphino)ethaneMo(CO)3
• CAS NO: 115889-91-3
• Molecular Weight: 726.494
• Mol File: 115889-91-3.mol
• Article Data: 1

Chemical Properties

• CAS DataBase Reference: fac-(4-methyl-2,6,7-trioxa-1-phodphabicyclo{2.2.2}octane)-1,2-bis(diphenylphosphino)ethaneMo(CO)3(CAS DataBase Reference)
• NIST Chemistry Reference: fac-(4-methyl-2,6,7-trioxa-1-phodphabicyclo{2.2.2}octane)-1,2-bis(diphenylphosphino)ethaneMo(CO)3(115889-91-3)
• EPA Substance Registry System: fac-(4-methyl-2,6,7-trioxa-1-phodphabicyclo{2.2.2}octane)-1,2-bis(diphenylphosphino)ethaneMo(CO)3(115889-91-3)

Safety Data

• Hazardous Substances Data: 115889-91-3(Hazardous Substances Data)

Upstream product

• 15444-66-3 (1,2-bis(diphenylphosphino)ethane)tetracarbonylmolybdenum 
• 1449-91-8 4-methyl-2,6,7-trioxa-1-phosphabicyclo-[2,2,2]-octane 
• 19349-52-1 fac-((pyridine)-1,2-bis(diphenylphosphino)ethane)Mo(CO)3 

Relevant articles and documents

Octahedral metal carbonyls. 64. Ligand exchange in fac-(py)(diphos)Mo(CO)3 in toluene (T) solution (Py = pyridine; diphos = 1,2-bis(diphenylphosphino)ethane): The fac -[(T)(diphos)Mo(CO)3] intermediate

fac-(py)(diphos)Mo(CO)3 (1; py = pyridine; diphos = 1,2-bis(diphenylphosphino)ethane) reacts thermally with phosphines, phosphites, and triphenylstibine (=L) in toluene to afford fac-(L)(diphos)Mo(CO)3 products (2). The observed rate law suggests that the mechanism involves dissociation of py from 1 and competitive reaction of the resulting steady-state intermediate, fac-[(diphos)Mo(CO)3] (3), with py (reversibly) and with L (irreversibly). Pulsed laser flash photolysis of (diphos)Mo(CO)4 also affords 3, identified through comparisons of its reactivities with L to those observed for 3 produced thermally. Evidence suggests, however, that a predominant reaction species formed after pulsed laser flash photolysis of (diphos) Mo(CO)4 is fac-[(T)(diphos)Mo(CO)3] (4b) (T = toluene), in which toluene occupies a site in the octahedral coordination sphere of Mo and probably interacts with Mo via an agostic hydrogen; reversible dissociation of toluene from 4b affords 3. Rate data after flash photolysis also support the formation of [(η1-diphos)Mo(CO)4] and cis-[(T)(η1-diphos)Mo(CO)4] (5). The latter undergoes irreversible chelate ring closure with concerted expulsion of toluene to afford (diphos)Mo(CO)4. Rate constants and activation parameters for various reaction steps are presented and are discussed in terms of the steric and electronic properties of L.