Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Reexamination Certificate
2006-10-17
2006-10-17
McKane, Joseph K. (Department: 1626)
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
C548S250000, C516S001000
Reexamination Certificate
active
07122676
ABSTRACT:
A process for preparing 5,5′-bi-1H-tetrazolediammonium salts (BHT.2NH3) maintaining a high yield through oxaldiimidic acid dihydrazide (OAH) from the starting materials which are cheaply available and are easy to handle. The 5,5′-bi-1H-tetrazolediammonium salts (BHT.2NH3) are prepared by dissolving the oxaldiimidic acid dihydrazide (OAH) obtained by the reaction of hydrated hydrazide with dicyan in an aqueous solution of a weakly acidic compound such as acetic acid, dropwisely adding an aqueous solution of sodium nitrite thereto to form an azide thereof and to effect the cyclization reaction by heating, adding an aqueous solution of sodium hydroxide to the reaction product to convert it into a 5,5′-bi-1H-tetrazoledisodium salt (BHT.2Na), reacting it with an aqueous solution of ammonium chloride, and recovering the formed ammonium salt as sparingly soluble crystals.
REFERENCES:
patent: 6156906 (2000-12-01), Hyoda et al.
patent: 952811 (1956-11-01), None
patent: 0 711 762 (1996-05-01), None
patent: 1 016 662 (2000-07-01), None
patent: 1035118 (2000-09-01), None
Brotherton, et al. The Synthesis and Chemistry of Cyanogen, Chemical Reviews, U.S., American Chemical Society, Washington, D.C., vol. 59, 1959, pp. 841-883.
Dedichen, Oxalhydrazidine and some heterocyclic complexes, Chemical Abstracts, vol. 31, No. 14, Jul. 20, 1937, Columbus, Ohio, Abstract No. 49878.
Curtius, et al., Mittheilungen Aus Dem Chemischen Institute Der Universitaet Kiels, 19. Synthesen von Benzolhydrazinen mittels Hydrazinhydrat, Journal fuer Praktische Chemie, Leipzig, DE, vol. 50, 1894, pp. 241-274.
Angelli, “Notizie Diverse” Gazzetta Chimica Italiana, Societa Chimica Italiana, Rome, IT, vol. 23, No. 11, 1983, pp. 101-104.
Hyoda Shunji
Kita Masaharu
Nemugaki Shuichi
Satoh Kohki
Sawada Hirotoshi
Coppins Janet L
Japan Hydrazine Co. Ltd.
Masuda Chemical Industries Co., Ltd.
McKane Joseph K.
Sherman & Associates
LandOfFree
Process for the preparation of... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for the preparation of..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the preparation of... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3658108