Octamethyl

Fig. 1. ORTEP drawing of the solid-state structure of 2,2, 3,3, 4,4, 5,5 -octamethyl-Ll -diarsaferrocene (44). [Reprinted with permission from Ashe et al.19 Copyright 1994 American Chemical Society.]...

Plus One REPEL-SILANE ES (a solution of 2% w/v of dichloromethyl silane in octamethyl cyclooctasilane) is used to inhibit the sticking of polyacrylamide gels, agarose gels and nucleic acids to glass surfaces and is available commercially (Amersham Biosciences). 

Octamethyl trisiloxane [107-51-7] M 236.5, m -80°, b 151.7°/747mm, 153°/760mm. Distil twice, the middle fraction from the first distillation is again distilled, and the middle fraction of the second distillation is used. [J Am Chem Soc 68 358, 691 1946, J Chem Soc 1908 1953.]... 

The template effects of potassium and lithium ions are responsible for the efficiency of the synthesis of macrocyclic ligands in 18-CROWN-6 and2,2.7,7,12,12,17,l 7-OCTAMETHYL-21,22,23,24-TETRAOXAPER-HYDROQUATERENE. 

Molecular Packing and Ring Interconversion by Solid State and Solution State NMR Spectra of Cyclododecane and Octamethyl-tetrasiloxane... 

The a,oo-difunctional PDMS is obtained by cationic polymerization of octamethyl-cyclotetrasiloxane (D4) in the presence of a known amount of tetramethyldisiloxane, acting as a functional transfer agent. Hydrosilylation reaction is carried out in toluene solution at 90 °C with a platinum catalyst. 

Silica is also deposited by the decomposition of diacetoxy-ditertiarybutoxy silane (DADBS) at 450-550°C and low pressure (< 1 Torr) and by the decomposition of octamethyl-cyclotetrasiloxane in ozone at 400°C at low pressure.P ]P 1... 

Rider JA, Moeller HC, Puletti EJ, et al. 1969. Toxicity of parathion, systox, octamethyl pyrophosphoramide, and methyl parathion in man. Toxicol Appl Pharmacol 14 603-611. 

The [n]pericyclines 3-6 are all colorless, crystalline,light- and air-stable solids which do not exhibit any shock sensitivity. They exhibit sharp melting behavior without showing signs of decomposition. However, octamethyl[5]pericycline 30... 

The stepwise replacement of fluorine atoms in fluorocyclophosphazenes, (NPF2) n = 3—5), by methyl groups has been followed.and n.m.r. spectroscopy showed that methyl-lithium in diethyl ether generally effects a geminal replacement pattern. With N3P3F6, only mono- and di-methyl derivatives were obtained, but with N4P4F8 the dimethyl (52), trimethyl (53), and octamethyl derivatives were noted. The formation of... 

Octamethyl pyrophos- phoramide 118-122/ 0.3 mm. 1.4612/ 1.1343/ Completely miscible 0.05 100 Almost odorless, colorless, somewhat viscous oil. Systemic poison. Absorbed by living plant (10, 11, 36. 38)... 

Toxic compounds that can be absorbed to a marked degree by a living plant through either its roots or its leaves have been called by British investigators systemic insecticides. Schrader (38) first found this peculiar property in certain acetals of 2-fluoroethanol and bis-(2-fluoroethoxy) methane, as well as in certain compounds of his organic phosphorus series, notably bis(dimethylamido)fluophosphate and octamethyl pyrophosphoramide. 

Octamethyl pyrophosphoramide is a colorless oil, completely soluble in water, benzene, acetone, and many other common organic solvents except the paraffinic hydrocarbons. Its hydrolysis rate has not been measured, but it appears stable in the absence of alkali. In England, this systemic insecticide has been used to control aphids on hops. There it has been calculated that only a negligible quantity of the poison ultimately may find its way into the beer made from the hops. Despite calculations of this sort, the use of octamethyl pyrophosphoramide on food or fodder crops in this country is definitely not to be recommended. However, it may prove useful if properly applied to control certain insects, especially those attacking ornamental plants, such as rosebushes, and possibly on the cotton aphid and grape phylloxera. The compound has only recently been made available experimentally. 

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