9,9-diethyl-2,7-bis

Tin, bis(diethyldithiocarbamato)diphenyl-angular parameters, 1,57 Tin, bis(diethyldithiocarbonato)diiodo-angular parameters, 1,57 Tin, bis(diethyl dithiophosphate)diphenyl-stereochemistry, 1,59 Tin, bis(diethyldithiophosphonium)diiodo-angular parameters, 1, 57 Tin, chlorotris(tropolone)-stereochemistry, 1, 82 Tin, cyclopentadienyl-, 3, 218 Tin, dibromobis(ethyldithiocarbonato)-angular parameters, 1, 57 Tin, dichlorobis(ethyldithiocarbonato)-angular parameters, 1, 57 Tin, dimethylbis(acetylacetone)-structure, 1, 58... 

DIAZACYCLOOCTADECANE, 54, 88 MACROCYCLIC POLYETHERS DIBEN-ZO—18-CROWN-6-POLYETHER AND DICYCLOHEXYL- 18-CROWN-6-POLYETHER, 52, 66 Malonaldehyde bis(diethyl acetal), 52, 139... 

The reaction leading to 20 was used to prepare 25 (Scheme 3.2-13) [35], starting from diethyl(propyn-l-yl)borane which served as a versatile reagent for the synthesis of other carboranes (vide infra). l,l-Bis(diethyl-boryl)propene 23 can be detected and isolated, whereas it was not possible to identify l,l,l-tris(diethylboryl)propane 24 in the reaction mixture. 

DI-p-CARBETHOXYETHYLMETHYLAMINE (Propionic Acid, 3,P -Methylimino-bis-, Diethyl Ester)... 

Fig. 3.162. Structure of LRSC 9-[(4-chlorosulphonyl)-2-sulphonylphenyl]-3,6-bis(diethyl)amino-xanthylium hydroxide inner salt. Reprinted with permission from S. M. Smith et al. [200].

Use of larger amounts of absolute ethanol causes formation of more of the acyclic 3-thiapentane-1,5-dial bis(diethyl acetal) 3,3-dioxide, with a corresponding reduction in yield of the cyclic product. 

The ozonolysis reaction, followed by reductive workup with sulfur dioxide, as described in Part A of the present procedure, illustrates a general method which has been developed for the preparation of acetals. Application of the procedure is illustrated by conversion of the following olefins in alcoholic solution to the corresponding acetals (1) l-chloro-4-(o-nitrophenyl)-2-butene to o-nitrophenylacetaldehyde dimethyl acetal in 84% yield (2) l,4-dibromo-2-butene tobromoacetaldehyde dimethyl acetal in 67% yield (3) 3-butenoic acid to malonaldehydic acid diethyl acetal ethyl ester in 61% yield (4) cyclopentadiene to malonaldehyde bis(diethyl acetal) in 48% yield and (5)... 

Phenylarsine bis (diethyl dithiocarbamate), secondary bonding by, 15 30-31 Phenylazidosilanes, properties, 9 141 (Phenylazo)acetaldoxime complexes, osmium, 37 270... 

Fig. 5 shows the SEC/UV and SEC/IR traces of PMMA samples (78) which were photopolymerized with different concentrations of photogensitizer (0.05 x 10 M, 0.08 x 10 M, 0.25 x 10 M and 0.5 X 10 M). The photosensitizer used was 4,4 bis-(diethyl amino) benzophenone (DEABP). From the UV traces it is seen that the photosensitizers are chemically bound to the polymer chains. The results also seem to indicate that a greater number of sensitizer fragments reside in the lower molecular weight regions. A considerable amount of free sensitizer can be detected by the UV detector (retention volume 210 ml) when t e Initial concentration of the sensitizer is above 0.08 x 10 M. The other... 

All four isomeric selenolopyridines which can be derived from benzoselenophene (423— 426 Scheme 123) have been described. Ethyl 3-hydroxyselenolo[2,3-fe]pyridine-2-carboxy-late (429) has been prepared as shown in Scheme 124 (73BSF704). Treatment of ethyl 2-chloropyridine-3-carboxylate with methaneselenol yields (427). Nucleophilic displacement of bromine in bromoacetic acid with subsequent loss of methyl bromide yields (428), which after esterification is cyclized under Dieckmann conditions to give (429). The parent compound (423 colorless oil with b.p. 92 °C/1 mmHg) is prepared either by cyclization of compound (430) and subsequent decarboxylation of the intermediate acid (equation 57) or by reduction of 2-nitroselenophene and subsequent condensation of the amino compound with malonaldehyde bis(diethyl acetal) in the presence of zinc chloride (equation 58) (76BSF883). Selenolo[3,2-6]pyridine (426 b.p. 127-129°C/10 mmHg m.p. 35.5-37.0°C) has been obtained in an analogous manner. 

TMP is also referred to as malonaldehyde bis(dimethyl acetal). 1,1,3,3-Tetraethoxypropane, or malonaldehyde bis(diethyl acetal), can be substituted for TMP. Stock and working solutions are prepared as for TMP. 

B-Aminoborazines are of particular interest for fundamental studies. In these compounds, boron is bonded to three nitrogen atoms with two different types of environment. B-Aminoborazines are also useful precursors for the synthesis of thermally stable polymers. Quite a few polycondensates of aminoborazines and copolymerisates with organic difunctional molecules have been described 4>. Of major interest are difunctional borazines yielding linear polycondensates. The condensation of l,3,5-tris(2,6-dimethylphenyl)-2,4-dichloroborazine (cf. Section II.2.5) with aliphatic, aromatic, and heterocyclic diamines, as well as the preparation of the same linear polyborazines by transamination of 1,3,5-tris(2,6-dimethylphenyl)2,4-bis(diethyl-amino)borazine with diamines was studied 139). 

Silver(n) and Silvery hi).—The cationic complex bis-(2,2, 2"-terpyridyl)Ag2+ has been isolated as its peroxydisulphate salt.217 The presence of a d-+d band at 15600 cm-1 is indicative of a six-co-ordinate ion. X-ray photoelectron spectra have provided Ag(3d5/2>3/2) binding energies for this complex and the mono-terpy complex. The influence of pyridine and 2-, 3-, and 4-picoline on bis(diethyl dithio-carbamato)AgH has been examined by e.s.r. spectroscopy.218 The results indicate formation of mono-addition products and the spin hamiltonian parameters for these complexes have been determined. 

R = C2Hs Diethylamino-phenyl-methanphosphonsaure-bis-[diethyl-amid] 38%... 

Bis-[2-cyan-ethyl]- -isopropylcster XII/1, 250 Bis-[l,l-dialkoxy-alkyl]- -ester E2, 185 Bis-[2,5-dibrom-phenyl]- XII/1, 369 Bis-[2,3-dichlor-phenyl]- XII/1, 368 Bis-[2,5-dichlor-phenyl]- XII/1, 368 Bis-[3,5-dichlor-phenylj- XII/1, 369 Bis-[diethylamino-methylJ- -propylester E2, 181 Bis-[(diethyl-methyl-silyloxy)-methyl- -(diethyl-methyl-silylester) E2, 171 Bis-[4-dimethylamino-phenyl]- XII/1, 235... 

Trimethylsilyloxy-ethan- -diethylester ans Phosphorigsaure-trimethylester und Chlor-trimethyl-silan E2, 378 1-Trimcthylsilyloxy-phenyl-methan- -bis-[diethyl-amid] E2, 414... 

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