Results 41 to 50 of about 49,972 (158)
2-Methylsulfanylbenzo[f]isoquinoline
Molbank, 2015 S-Methylation of a 4-(naphth-2-yl)-β-thiolactam gives an intermediate 4-(naphth-2-yl) substituted 1-azetine which undergoes a [2+2] ring-opening followed by electrocyclic ring closure of the resulting 2-azadiene to give a benzo[f]isoquinoline.
Faisal Jamshaid +2 more
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Topics on the Ratliff-Rush Closure of an Ideal
پژوهشهای ریاضی, 2019 Introduction Let be a Noetherian ring with unity and be a regular ideal of , that is, contains a nonzerodivisor. Let . Then . The :union: of this family, , is an interesting ideal first studied by Ratliff and Rush in [15].
Amir Mafi, ssh Arkian
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Perfect closures of rings and schemes [PDF]
Proceedings of the American Mathematical Society, 1965 0. In [31, Serre has defined the notion of a perfect variety over a field of characteristic p > 0. Of course, a perfect variety is, in general, not a variety. The appropriate setting is that of schemes [2]. We show how to construct the perfect closure of a scheme, in particular, of a ring A, of characteristic p. This amounts to showing that the functor
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Inadvertent rupture of iridociliary cyst following transscleral Diode laser
Indian Journal of Ophthalmology, 2013 Primary iridociliary cysts can induce plateau iris configuration and angle closure glaucoma. We report a patient with bilateral, primary, ring-shaped, solitary iridociliary cysts.
Nikhil S Choudhari +2 more
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Molecules, 2020 A new synthetic pathway to four substituted imidazoles from readily available 2-((4-aryl(thienyl)-5H-1,2,3-dithiazol-5-ylidene)amino)phenols has been developed.
Ilia V. Baranovsky +5 more
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Tight closure in F-rational rings [PDF]
Nagoya Mathematical Journal, 1994 All rings are commutative with unit and modules are unital. With one exception all rings are Noetherian. We consider only rings of positive characteristic p. Section 0 contains background, definitions and terminology.
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Oman Journal of Ophthalmology, 2016 Iridociliary cysts of pigment epithelium are rare, ring cysts being rarer still, and usually benign in their clinical course. Presented here is a case of ring iridociliary cyst that resulted in secondary synechial angle closure with an acutely elevated ...
Vanita Pathak-Ray, Iqbal Ike K Ahmed
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Beilstein Journal of Organic Chemistry, 2011 Preparations of de novo acyclic 2-amido-dienes and 3-amido-trienes through 1,3-hydrogen shifts from allenamides are described. These 1,3-hydrogen shifts could be achieved thermally or they could be promoted by the use of Brønsted acids.
Ryuji Hayashi +4 more
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Commutative regular rings with integral closure [PDF]
Transactions of the American Mathematical Society, 1975 First order conditions are given which are necessary for a commutative regular ring to have a prime integrally closed extension. If the ring is countable these conditions are also sufficient.
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Δ-Closures of Ideals and Rings [PDF]
Transactions of the American Mathematical Society, 1989 It is shown that if R R is a commutative ring with identity and Δ \Delta is a multiplicatively closed set of finitely generated nonzero ideals of R R , then the operation I → I Δ = ∪
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