RE: ORGLIST: PIGMENT YELLOW 101 (help)

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From: Yuehui Zhou (yuehuizhou$##$hotmail.com)
Date: Thu Mar 17 2005 - 04:34:05 EST


Vilsmeier reaction may give higer yield.

Y Zhou

>From: "Mathews Jose K." <mathews_jose_k@yahoo.co.in>
>To: everybody@orglist.net
>Subject: ORGLIST: PIGMENT YELLOW 101 (help)
>Date: Wed, 16 Mar 2005 07:33:25 +0000 (GMT)
>
>HI ALL,
>
>Iím synthesizing PIGMENT YELLOW 101 (itís the aldazine of 2-hydroxy naphthaldehyde) so I go by the route 2-naphthol to 2-hydroxy naphthaldehyde then the condensation 2 moles of the aldhehyde with hydrazine hydrate  to get the pigment.
>
>For the sysnthesis of aldehyde im getting only 45% yield through RT reaction  (chloroform and sodium hydroxide) Can anybody tell a better route where no gas is used and no cynide is used. Thx in advance.
>
>Any patents on pigment yellow 101 is also a nice reference
>
>
>
>MATHEWS JOSE
>
>MUMBAI
>
>
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