The crystal structure of lithium polyphosphate, LiPO3, has been solved with 3487 independent reflexions. The unit cell is monoclinic with a = 16.453 (2), b = 5"405 (1), c = 13"086 (2) A, 8= 98.99 (2) ° and Z= 20; space group In. The final R for all observed reflexions is 0.034. The main characteristic of this arrangement is a (POa) chain with a period of ten tetrahedra in the [10T] direction.

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Monoclinic, P21/c, a=10.748 (1), b= 6.643 (6), c = 13.864 (2) .A, fl= 93.50 (1) °, C6H13OzPSe, Z=4, F.W. 243.1, F(000)=488, Dc=1"63, Dx = 1.59 (2) g cm -a. The ring adopts a chair conformation with P---Se lying in the equatorial position.Introduction. The sample of 2-seleno-2-methoxy-5,5dimethyl-l,3,2-dioxaphosphorinane was obtained by addition of Se to 2-methoxy-5,5-dimethyl-l,3,2-dioxaphosphorinane and recrystallized from CC14. Systematic absences were hOl with l odd and 0k0 for k odd.

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