Structural Diversity in Lithium Aryloxides, Part 1. Structurally Characterized [Li(OAr)(THF){sub x}]{sub n} where OAr = OC{sub 6}H{sub 5}, OC{sub 6}H{sub 4}(2-Me), OC{sub 6}H{sub 3}(2,6-Me){sub 2}, OC{sub 6}H{sub 4}(2-Pr{sup i}), OC{sub 6}H{sub 3}(2,6-Pr{sup i}){sub 2}, OC{sub 6}H{sub 4}(2-Bu{sup t}), OC{sub 6}H{sub 3}(2,6-Bu{sup t}){sub 2}