In the reaction of pyrazine-2-carb-oxy-lic acid and stannic chloride in methanol, one equivalent of the carb-oxy-lic acid is methyl-ated at the 4-amino site and is also esterified, yielding the title salt, (C(7)H(9)N(2)O(2))[SnCl(4)(C(5)H(3)N(2)O(2))]. The Sn(IV) atom in the anion is N,O-chelated by a pyrazine-2-carboxyl-ate in a cis-SnNOCl(4) octa-hedral geometry.

The lithium-tin exchange, a metathesis reaction used for the preparation of organolithium reagents, proceeds by way of intermediate pentorgano "ate" complexes. Under suitable conditions these complexes can be observed spectroscopically. The formation constants of the complexes are dramatically increased by polar coordinating solvents such as THF and HMPA. The "ate" complexes have trigonal bipyr...

In the reaction of pyridine-2-carb-oxy-lic acid and stannic chloride in methanol, one equivalent of the carb-oxy-lic acid is protonated at the amino site and is also esterified, yielding the title salt, (C(7)H(8)NO(2))[SnCl(4)(C(6)H(4)NO(2))]. The Sn(IV) atom in the anion is N,O-chelated by a pyridine-2-carboxyl-ate in a cis-SnNOCl(4) octa-hedral geometry. The cation is linked to the anion by a...

Calcium deficiency causes Endocarp Lesion disorder in pistachio nut. To investigate the effects of various calcium treatments on Endocarp Lesion disorder and some nut qualitative characteristics in Pistachio cv. Akbari, an experiment was done in completely randomized design with four treatments (1- control treatment, 2- calcium chelate foliar spray, 3- calcium nitrate and 4– calcium sulfate (gy...

      Calcium acetate is used as an oral phosphate binder to control hyperphosphatemia in patients with chronic renal failure. Compared to calcium carbonate, control of hyperphosphatemia can be achieved at lower calcium administration with calcium acetate which likely reduces the risk of hypercalcemia. In this study, various formulations of calcium acetate tablets were prepared and their disint...

In the title salt, (C(7)H(11)N(2))[SnCl(4)(C(10)H(6)NO(2))], the Sn(IV) atom is chelated by the N,O-bidentate carboxyl-ate ions and four chloride ions, showing a distorted octa-hedral SnNOCl(4) coordination. In the crystal, the cation and anion are linked by a pyridinium-carboxyl-ate N-H⋯O hydrogen bond.

In the title complex, (C(24)H(20)P)(2)[Sn(C(2)H(3)NO(2)S(3))(3)], the Sn(IV) atom is coordinated by three N-(methyl-sulfon-yl)dithio-carbimate bidentate ligands through the anionic S atoms in a slightly distorted octa-hedral coordination geometry. There is one half-mol-ecule in the asymmetric unit; the complex is located on a crystallographic twofold rotation axis passing through the cation and...

conclusions: the results of the present study indicated that oral preparation of cm with an acceptable taste is feasible. background: chlorpheniramine maleate (cm) is widely used as an antihistaminic drug but it is very bitter and as yet no mouth dissolving/disintegrating taste-masked preparation that might be useful for pediatric and geriatric patients is available in the market. objectives: t...