No abstract

3-Mcthvl-[-phenvl-4-(4'-nitrobenzylidinc)-2-pyrazoliii-5-one I reacts with 3-methyl-l-phenyl-2-pyrazolin-5onc Π in acetic anhydride/pcrchloric acid mixture to give the pyrylium salt III. Reaction of III with amines and active methylenes were studied.In a previous paper(l) we have prepared pyrazol[5,4-bjpyrylium salts using 3-mcthyl-2-pyrazolin-5-one. In t this paper and in continuation of our program to the synthesis of heterocyclic pyrylium salts we represent a new Brought to you by | Purdue University Libraries Authenticated Download Date | 6/3/15 4:03 AM Vol. 2. No. 5, 1996 Preparation and reactions of 1,7-dihydro-3,5-dimethyl-Treatment of the pyrylium salt ΙΓΙ with ammonia leads to l,7-dihydro-3,5-dimethyl-4-(nitrophenyl)-l,7diphenyl-dipyrazolo[3,4-b:4\3 x -e]pyridine VI (2-4), through opening of the pyrylium nuclese followed by removal of water molecule. Conversion to pyridine derivatives also occurred when III was treated with butylamine to give VII (5to Ο) σ> ο> CM 3 •α ο > ν ο φ GC

No abstract

<p>The paper discusses a countryside eco-bridge designed to serve pedestrians and cattle in an agricultural area near Cairo in Egypt. This green design presents a simple and safe link that addresses serviceability and economy.</p><p>The designer proposed a crossing made out of steel and cast-in-place concrete. Special architectural treatments were applied to demonstrate the flexibility of concrete and steel. Steel railings, protecting fences, attractive light poles and textured concrete stairs complement the character of this particular site. Color and texture are chosen to be coherent with the environment inspired by climate, culture and landscape.</p>

In this paper, we introduce the concept of fuzzy semi-essential (large)  submodule  , and we study  a necessary and sufficient condition for a fuzzy submodule of a fuzzy module  to be a fuzzy semi-essential (large)  submodule  , also fuzzy images and fuzzy inverse-images of generalized fuzzy semi-essential (large)  submodule are studied.