O-, N- and C-bicyclopentylation using thianthrenium reagents

I D C O P I N I O N

The relevance of security as one of the major contributors to an effective operational infrastructure has been growing in importance over the past 3-5 years, and today it resides as one of the two top investment priorities for senior management (the other one being critical server virtualization). Effective management by organizations when dealing with targeted and multiple parallel attacks com...

Copper-catalyzed O-arylation of N-protected 1,2-aminoalcohols using functionalized trivalent organobismuth reagents.

The O-arylation of 1,2-aminoalcohols using functionalized triarylbismuth reagents is reported. The reaction can be performed using substoichiometric amounts of copper acetate and operates under mild conditions. Good functional group tolerance is observed, giving access to a range of β-aryloxyamines. The effect provided by the amino group in the arylation reaction is investigated.

تهیه ترکیبات جدید حاوی اسکلت های 3p(n) ، 3p(o)(n) ، 2p(o)(o)(n) و 2p(o)(c)(n) : بررسی های طیفی و ساختاری

در این پژوهش فسفونیک آمیدهای php(o)(nhch2c6h4-4-ch3)2 (1)، php(o)(nhc5h9)2 (2)، php(o)(nc5h9-4-ch3)2 (3) و php(o)(nhc6h4-4-cl)2 (4)، فسفریک تری آمیدهای (4-ch3-c6h4nh)2p(o)(nhc6h4-4-cl) (5)، ((ch3)(c6h11)n)2p(o)(nhc6h4-4-cl) (6)، (oc4h8n)2p(o)(nhc6h4-4-cl) (7)، (4-ch3-c5h9n)2p(o)(nhc6h4-4-cl) (8)، (c3h6)(nh)2p(o)(nhc6h4-4-cl) (9)، (4-ch3-c5h9n)2p(o)(nhc6h4-4-ch3)(10)، p(o)(nhc6h4-4-cl)3 (11)، آم...

I C O M M U N C a T I O N I

Randomized selection in n+C+o(n) comparisons

In this paper we present a randomized selection algorithm that with high probability 1 − 1/nρ, for any constant ρ > 1 requires n + C + o(n) comparisons to determine the C-th order statitistic of n keys thus matching a corresponding lower bound on the average number of comparisons required. Low order terms in the number of comparisons performed can also be reduced by extending the algorithm of F...