Examples describe the preparation of B-dipropyl boroxazolidone, B-dipropyl-C-methyl boroxazolidone, B-dipropyl-C-ethyl boroxazolidone, B,B, - dipropyl - C - (methyl mercaptoethyl)-boroxazolidone, B - propyl - benzboroxazone, and the mixed anhydride of dipropyl borinic acid and 6-...
Cl. 260-1125 4 Claims ABSTRACT OF THE DISCLOSURE An improved process is described for preparing peptides by the mixed anhydride method. The improvement consists in using certain special amines which have at least one methyl group attached to nitrogen, and an electronegative group Beta to the ...
In which of the following compounds resonance does not occurs (a)H2O(b)SiO2(c )SO2(d)CO2 View Solution P4O10is an anhydride of : View Solution P4O10is the anhydride of the following View Solution Doubtnut is No.1 Study App and Learning App with Instant Video Solutions for NCERT Class ...
poly[styrene-alt-(maleic anhydride)]. Alternating sequence arrangements can form constitutionally regular structures and may, in those cases, also be named utilizing the structure-based nomenclature for regular single-strand organic polymers. The example above would then be named poly[(2,5-dioxotetrah...
of pyridine and 1 part of propionic anhydride dilute to volume with the solution and mix. Standard Preparations: Transfer 12- 25- 37- and 50-mg portions of USP Alpha Tocopherol Reference Standard accurately weighed to separate 50- ml Erlenmeyer flasks ...
Reaction of the iron ketenylidene (PPN) 2 [Fe 3 (CO) 9 CCO] [PPN = bis (triphenylphosphine)nitrogen(+1)] with trifluoroacetic anhydride forms a highly ele... MP Jensen,M Sabat,DF Shriver - 《Journal of Cluster Science》 被引量: 26发表: 1990年 The ketenylidene route to mixed-metal ...
with four 50-ml portions of water discard the washings and dry over anhydrous sodium sulfate. Evaporate the dried ether solution on a water bath under reduced pressure or in an atmosphere of nitrogen until about 7 or 8 ml remain and then complete the evaporation removing the last traces of ...
In the complex, a square planner geometry was observed around the Ni(II) central atom coordinated with the donor atoms of the Schiff base ligand and one nitrogen of imidazole group. In addition, the catalytic activity of the complex on the three-component condensation of hydrazine hydrate with ...
Boranatodimethylphosphinic acid H 3B(CH 3) 2POH, its anhydride H 3B(CH 3) 2P O P(CH 3) 2BH 3, salts, complexes, esters and carboxylates have been prepared and identified through analytical and spectroscopic studies. The ... H Schmidbaur - 《Journal of Organometallic Chemistry》 被引量...
METHOD OF Gas Liquid Chromatographic Method ASSAY Reagents and solutions: Internal Standard Solution: Transfer about 600 mg of hexadecyl hexadecanoate, accurately weighed, to a 200-ml volumetric flask, dissolve in a solution containing 2 parts of pyridine and 1 part of propionic anhydride, dilute to...