title: Expeditious access to the most easily ionized closed-shell molecule, W2(hpp)4.
abstract: A new synthetic path, far superior to either of those previously available, to the W2(hpp)4 molecule (Hhpp = 1,3,4,6,7,8-hexahydro-2H-pyrimido[1,2-a]pyrimidine) is reported. The reaction of W(CO)6 with Hhpp in o-dichlorobenzene at 200 degrees C produces W2(hpp)4Cl2 in a one-pot reaction in over 90% yield. This compound is stable and easily stored for further use, and it can be efficiently reduced in a one-step reaction to the title compound W2(hpp)4.
authors.affiliation: Department of Chemistry, Laboratory for Molecular Structure and Bonding, PO Box 30012, Texas A&M University, College Station, TX 77842-3012, USA. cotton@tamu.edu
authors.forename: F Albert
authors.initials: FA
authors.lastname: Cotton
authors.forename: James P
authors.initials: JP
authors.lastname: Donahue
authors.forename: Dennis L
authors.initials: DL
authors.lastname: Lichtenberger
authors.forename: Carlos A
authors.initials: CA
authors.lastname: Murillo
authors.forename: Dino
authors.initials: D
authors.lastname: Villagrán
mesh_terms: D004563:Electrochemistry; D011743:Pyrimidines / Q000737:chemistry*
chemical_list: D011743:Pyrimidines; C030986:pyrimidine