Extraction of the timber of sneezewood has given a number of chromones and coumarins. The constitution of t w o novel chromones. karenin and desoxykarenin, has been elucidated by conversion to a derivative of a third chromone peuceni n.

w G 12 8QQ Crystallographic studies of 1,3,5-tris-(0-, m-, and p-fluorophenyl) -1,3,5-triazacyclohexane disclose examples of diaxial-equatorial chair conformations for 1,3,5-triaryl-I ,3,5-triazacyclohexanes. The repulsion between axial aryl groups is relieved by the N-C(aryl) axial bonds being displaced outwards from ideal tetrahedral positions by 17-21'. The orientation of the equatorial aryl ring about the N-C(aryl) bond depends on the position of the F substituent. In the p -F compound the angle between

G 12 8QC 3-(2-Carboxyethyl) -4-piperidone (5), prepared from N-benzyl-4-piperidone and benzyl acrylate (S), was thermally cyclized in the presence of dibutyltin oxide to 1 -azabicyclo[3.3.1] nonane-2,6dione (4), which possesses a bridgehead amide nitrogen. The boat-chair conformation of (4) in the solid state has been characterized b y X-ray crystal structure analysis and the bridgehead amide shown t o be appreciably distorted from planarity, with N ( l ) displaced by 0.37 A from the plane of C(2), C(8), and C(9). Crystallographic data are a = 6.214( 4), b = 6.845(5), c = 17.850(8) A, Z = 4, space group P2,cn. X -Ray intensity measurements were made on a four-circle diffractometer and leastsquares adjustment of the atomic parameters converged at R = 0.038 for 1 004 reflections.

No abstract

Solid polymer electrolytes (SPE) have been identified as a class of materials which could enable the fabrication of high energy density solid state lithium rechargeable batteries which could meet the performance requirements for advanced portable electronic and automotive applications. In order to achieve this goal, novel SPE systems having high ionic conductivity and good mechanical properties at or near ambient temperature must be developed. Novel lithium salts believed to be useful in realizing this objective have recently been proposed. The thermal behavior of SPE systems based on high molecular weight poly(ethy1ene oxide) (PEO) and on two novel salts, the lithium bisftrifluoromethanesulfony1)imide (LiTFSZ) and the lithium trisftrifluoromethylsulfony1)methanide (LiTSFM) is reported and compared with the thermal behavior of the high molecular weight PEO-lithium trifluoromethane sulfonate (LiTFLT) SPE system. Phase diagrams for the PEO-LiTFSI and PEO-LiTFSM SPE systems have been established and are discussed in terms of their impact on SPE-based rechargeable lithium battery technologies. The use of a novel plasticizer in conjunction with the PEO-LiTFSZ-based S P E system is reported and it is shown how this modifies the thermal behavior of the PEO-LiTFSl SPE system. KEYWORDS: polymer electrolytes; salt; phase d iag ra m(1) the use of an alternative lithium anode, such as lithium intercalation materials (e.g. lithium carbon), and