Nitrosyl tetrafluoroborate

NOCl, Pyr, —20° H2O, reflux, 70-90% yield. Olefins were not affected under these conditions. The related nitrosyl tetrafluoroborate has also been used."... 

Reaction of [Ir(rj -cod)(/x-pz)]2 with nitrosyl tetrafluoroborate yields 140 (L2 = cod), the cationic nitrosyl complex [85JCS(CC)908]. The 3-methylpyra-zolato complex reveals the same type of behavior, while 3,5-dimethylpyrazolato derivatives give a different kind of product Oxidation of [Ir( j -cod)(/i,-pz )]2 with nitrosyl tetrafluoroborate or hexafluorophosphate leads to 141 (X = BF4, PFg). 

Monosubstituted hydrazines treated with nitrous acid give azides in a reaction exactly analogous to the formation of aliphatic diazo compounds mentioned in 12-47. Among other reagents used for this conversion have been N204 ° and nitrosyl tetrafluoroborate (NOBp4). ... 

Al-Nitrosodiethanolamine, 2 449, 450 Nitroso dyes, 9 263-264 Nitro soluble dyes, 7 373t Nitroso soluble dyes, 7 373t Nitrosomonas, use in recirculating aquaculture biofiltration, 3 196 P-Nitrostyrenes, preparation by nitration of styrenes, 16 581 Nitrosyl chloride, 20 634 Nitrosyl complexes, osmium, 19 642 Nitrosyl perchlorate, 18 279 Nitrosyl tetrafluoroborate, 4 144t n-Nitrotoluene, 17 263... 

The transannular bond formation between Te-Te and Te-S bonds giving the dications E and E is afforded by treatment of compounds A and B with the oxidizing agents nitrosyl tetrafluoroborate and hexafluorophosphate or with D2SO4. 

Nitric oxide readily loses an electron to form nitrosyl or nitrosonium ion, NO , which is known to form salts, such as nitrosyl hydrogen sulfate, (N0) (HS04) or nitrosyl tetrafluoroborate, (N0) (BF4). ... 

In a procedure identical to that described in Section B, the reaction is performed using 2.5 g (7.1 mmol) of hexacarbonyltungsten (Alfa) and 1.66 g (14.2 mmol) of nitrosyl tetrafluoroborate (Aldrich, sublimed 220 °C, 10-3 torr) An emerald green complex is isolated to yield 3.95 g (96%) of cis-tetrakis-(acetonitrile)dinitrosyltungsten(II) bis[tetrafluoroborate(l —)]. 

Reaction of vinyl azides with nitrosyl tetrafluoroborate gives furazans in good yield, particularly when the alkene is 1,2-dialkyl-substituted. For example, 1-azidocyclooctene and 2-azidobut-2-enes yield (19 n = 6) and (1, R1 = R2 = Me), respectively 1,2,4-oxadiazoles may also be formed as by-products. 

Tertiary hydrogens in substrates which readily form carbocations. such as adamantane, dimantane, and triphenylmethanc, are selectively fluorinated by treatment with a mixture of nitrosyl tetrafluoroborate and 70% hydrogen fluoride in pyridine in excellent yield.28 This reaction has been extended to secondary hydrogens /( to a bromine atom in a series of bro-moalkanes, e.g. fluorination of bromocyclohexane to give nwi.y-1 -bromo-2-fluorocyclohcxane (8).26... 

Nitrosyl tetrafluoroborate (Nitrosonium tetrafluoroborate), NOBF4. Mol. wt. 116.83. Supplier ROC/RIC. 

Reaction with olefins Nitrosyl tetrafluoroborate reacts with primary or secondary olefins in acetonitrile to give 2-methyl-N-hydroxyimidazolium salts (1) at -15 to 0°. 

Diazotization of 1-aminocyclopropanecarboxylic acid in the presence of a carbon nucleophile gives a-substituted cyclopropanecarboxylic acids in moderate yields. When this amino acid was allowed to react with sodium nitrite in trifluoroacetic acid or with nitrosyl tetrafluoroborate in acetonitrile in the presence of potassium cyanide, 1-cyanocyclo-propanecarboxylic acid (1) was obtained in 64% yield. Similarly, l-(3-trimethylsilylprop-yl)cyclopropanecarboxyIic acid (2) was isolated in 30% yield when diazotization was carried out in the presence of allyl trimethylsilane. ... 

The electric studies were later extended by the same authors to [ (Ci2H250)8Pc 2Lu], and the oxidised species [ (Ci2H250)8Pc 2Lu] -[Bp4] , obtained by oxidation of the parent compound with nitrosyl tetrafluoroborate. The electrical properties were determined in the... 

As the cofacial dimer 1 is a readily available compound, the best method for the preparation of thiatriazinium salts is to treat 1 with nitrosyl tetrafluoroborate or hexafluorophosphate. The reaction mixture must be kept under inert gas during the evolution of nitrogen oxide. A direct method is the reaction of 1-fluorothiatriazines, e.g. 3, with arsenic(V) fluoride or phosphorus pentafluoride. The so-called silver salt method consists of the reaction of 1-chlorothia-triazincs with silver(I) hexafluoroarsenate in liquid sulfur dioxide. 

Benzotriazine 1,3-dioxide (2 a) was prepared in 65% yield by treating the phenyldiazene oxide 1 with nitrosyl tetrafluoroborate in acetonitrile and then with 3-chloroperoxybenzoic acid in pyridine,34 or by reacting 1 with dinitrogen pentoxide in nitromethane or dichloromethane.34 The in situ occurring reaction of 1 with nitric acid and sulfuric acid led to the isolation of the nitro derivatives 2b-d.33... 

When the phenyldiazene oxide 7 was treated with nitrosyl tetrafluoroborate the diazonium salt 8 was obtained which formed the yellow-colored 5,7-dibromobenzo-l,2,3,4-tetrazinc 1-oxide (9) at 40 UC.38... 

The salt 8 (prepared from the corresponding aniline and nitrosyl tetrafluoroborate in MeCN at - 10 -> 0°C) was placed on silica gel and eluted with warm CHC13 at 40 °C. The solution was collected in a well-cooled flask, then the solvent was removed under reduced pressure at 0°C. The residue was washed with pentane to give pure 9 as a yellow solid yield 81 % mp 78-80°C (dec.).38... 

---