Poly methylene compounds

The di-amines are strong di-acid bases with ammoniacal odor and readily form salts with acids. The di-amines of the higher hydrocarbons, in which the two amine groups are attached to the end carbon atoms, are known as poly-methylene compounds because all of... 

Referring again to the saturated ali-cyclic, or poly-methylene, compounds and comparing them with the isomeric olefine compounds, we find some exceedingly interesting facts. In connection with the idea... 

The poly-methylene compounds may be represented by the following drawings ... 

CHR) , formed, e g. from the reaction of diazomethane and alcohols or hydroxylamine derivatives in the presence of boron compounds or with metal compounds. Poly-methylene is formally the same as polyethene and the properties of the various polymers depend upon the degree of polymerization and the stereochemistry. 

The equation for the diffusion coefficient in a gaseous state, Dc, is the starting point for the derivation of an equation for diffusion coefficients in an amorphous solid state (S). The homologous series of n-alkanes is used as a reference class of chemical compounds which asymptotically reach an unlimited molecular chain in the form of poly methylene. The diffusion coefficient, DSji, is derived theoretically for a member of the series with j carbon atoms at infinite dilution in a matrix of a n-alkane with i carbon atoms in the molecule. In addition, the diffusion in polymethylene, which is considered as the reference structure for all polymers is also derived theoretically. 

A bis-methylene compound of a spiro skeleton structure 21 is polymerized to produce a poly(ether carbonate) 22 (Eq. (16)) I3 I4). The course of the polymerization has been explained by a scheme involving free-radical intermediates 23 and 24. 

The microstructure and the properties depend on the cis/trans ratio of the ring bonding and on the stereochemistry between the rings. Poly(methylene-l,3-cyclopentane) obtained by cyclopolymerization of 1,5-hexadiene shows four different structures from which the tram isotactic structure is predominant, when using simple biscyclopentadienyl compounds. Higher substituted (pen-tamethyl) zirconocenes yield mainly as-connected polymers which are highly crystalline and have melting points up to 190 °C. 

The linear polyethers are model compounds to show the effect of the insertion of one oxygen atom at different positions into the polyethylene -CH2-CH -repetitive unit. What will be the influence on the polymer XPS valence band spectrum, compared to the one of polyethylene (Figure 2) Our study was conducted on three materials poly(methylene oxide) or PMO, poly(ethylene oxide) or PEO, and poly(tetramethylene oxide) or PTMO, that are... 

While, however, penta-methylene is the most stable ali-cyclic compound of the poly-methylene group it is hexa-methylene which is of special interest and importance. This importance is due to the fact that it is the connecting link between the ali-cyclic compounds (carbo-cyclic compounds not derived from benzene, i.e. the poly methylenes) and benzene itself. Thus it becomes the connecting link between the aliphatic open-chain compounds and the very large and important division including benzene and its derivatives. 

Zimmermann reaction. The reaction that occurs between methylene ketones and aromatic poly-nitro compounds in the presence of alkali. When applied to 17-oxosteroids, the colored compounds formed can be used for the quantitative determination of 17-oxosteroids. 

Chain Transfer to Organometallic Compounds. Hydroxy-terminated poly(methylene-l,3-cyclopentane) has been prepared by selective chain transfer to aluminum in the cyclopolymerization of 1,5-hexadiene with the sterically... 

Polarization infrared spectral data. X-ray analysis and normal coordinate treatment revealed the stable molecular conformation of poly(methylene disulfide) to be the GG G form [88] which was also confirmed from the results of semi-empirical CNDO/2SCF MO calculations [89]. Poly(ethylene disulfide) was also found to exist in a similar conformation as that of poly(methylene disulfide) [90]. Under vacuum at 50 °C, polysulfide polymers of methylene and ethylene with sulfur rank of two and four were exposed to UV radiation [91]. While poly(methylene disulfide) and poly(methylene tetrasulfide) yielded polymeric carbon monosulfide, hydrogen sulfide and carbon disulfide as the major degradation products, the ethylene counterparts produced the same compounds except carbon disulfide. The tetrasulfide polymers also formed volatile products which on condensation gave the original polymer. 

Polyquinolines represent another class of photocon-ductive 7r-conjugated rigid-rod polymers. High molecular weight polyquinolines (M 5 x 10 ) are prepared by an acid catalyzed reaction of aromatic o-amino ketones with keto methylene compounds [468,469]. Stolka and co-workers [470] recently reported on steady state photoconductivity measurements in poly(2,2 -(biphenylene)-6,6 -bis(4-phenyl quinoline)) (73b). In both polymers like in other conjugated polymers the low energy threshold of... 

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