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J Am Chem Soc. 2005 Aug 10;127(31):10808-9.

Expeditious access to the most easily ionized closed-shell molecule, W2(hpp)4.

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  • 1Department of Chemistry, Laboratory for Molecular Structure and Bonding, PO Box 30012, Texas A&M University, College Station, TX 77842-3012, USA. cotton@tamu.edu

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.

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