Die nach Literaturmethoden dargestellten Titelverbindungen (Ia) bzw. (Ib) kristallisieren mit Z=4 in der RG I2/a bzw. P21/c. Die Koordination am Li ist tetraedrisch.
The organolithium monodentate ether solvates [Li(Et20)benzyl],, 1, and [Li(THF)zmesityl]2, 2, have been isolated and characterized by X-ray diffraction. The structure of 1 consists of infinite chains of alternating benzyl and lithium ions with lithium also coordinated to EtzO. The geometry at lithium is approximately trigonal planar, provided only the ether oxygen and the close contacts to the CH2 carbons of each benzyl group are considered. A somewhat weaker interaction with the adjacent ring carbon on each benzyl is also apparent. The structure of 2 consists of discrete centrosymmetric dimers of two lithium and two mesityl groups. The lithium atom is also coordinated to two THF molecules. The crystal data at 140 K are as follows. I: a = 7.503 (3) A, b = 13.811 (3) A, c = 21.498 (6) A, a = 103.50 ( 2 ) O , p = 93.93 (3)O, y = 91.77 (2)O, 2 = 8, space group Pi, R = 0.078. 2: a = 9.566 (3) A, b = 9.488 (3) A, c = 17.927 (6) A, p = 102.69 (3)O, 2 = 2, space group P2Jn, R = 0.065.
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