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55012-72-1

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55012-72-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 55012-72-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,5,0,1 and 2 respectively; the second part has 2 digits, 7 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 55012-72:
(7*5)+(6*5)+(5*0)+(4*1)+(3*2)+(2*7)+(1*2)=91
91 % 10 = 1
So 55012-72-1 is a valid CAS Registry Number.

55012-72-1Downstream Products

55012-72-1Relevant articles and documents

Total synthesis of (±)-cis-5-hydroxycalamenene

Poon Ng, Po S.,Banerjee, Ajoy K.

, p. 2261 - 2268 (2008/09/21)

A total synthesis of (±)-cis-5-hydroxycalamenene 1 has been achieved from tetralone 5, which in turn was prepared from 5-methoxy-α-tetralone 3. Grignard reaction of compound 5 with isopropylmagnesium chloride, followed by dehydration and aromatization, provided the substituted naphthalene 7 whose conversion to (±)-cis-5-hydroxycalamenene 1 was accomplished by demethylation, formylation, and hydrogenation. Copyright Taylor & Francis Group, LLC.

Studies in Terpenoids: Part LV - Synthesis of 5-Hydroxycalamenene, a Phenolic Sesquiterpene from Bazzania tricrenata

Sangaiah, R.,Rao, G. S. Krishna

, p. 13 - 15 (2007/10/02)

Fries rearrangement of o-cresyl isobutyrate (IV) gives the o-hydroxyketone (V).Dehydration and saponification of the Reformatsky reaction product of the methoxyketone (VI) with ethyl bromoacetate affords the unsaturated acid mixture (VII).The saturated aryl methylpentanoic acid (VIII) derived from VII is reacted with ethyllithium to give the ketone (IX).The secondary alcohol (X) obtained from IX is cyclodehydrated and demethylated in one step to give 5-hydroxycalamenene (I) which is produced stepwise also from X via the methoxytetralin (XI) obtained by PPA treatment.

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