From: Anand Pandey (anand.pandey$##$alembic.co.in)
Date: Sat Nov 11 2006 - 01:07:12 EST
Dear Dharsan
1. The more electronegative compound (phenolic, oxifen containing, halogen
containing) ionize in negative node and electropositive compound ( others90%
hydrocarbons ) ionize in +ve mode. With +ve mode we get the mass +1 and
in -ve mode we get mass as -1 of the molecular ion peak.
2. Yes, If the subject compound ionizes well the impurity level as 5% get
the molecular ion peak and can be identified in spectra.
3. In mass spectra it gives the mixed mass scattered spectra of the compound
as such but in mass combined with LC/GC give the exact mass of each and
every peaks (impurity /product). As per interpretation is concern the mass
interpretation is easy than LCMS. LCMS needs critical blank subtraction
while taking the spectra. LCMS is mostly used for impurity profiling.
> Today's Topics:
>
> 1. LC-MS (dharsan sunday)
> 2. hi (Kishore Babu Ch)
> 3. O-glycosylation (Peng Gao)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 9 Nov 2006 05:54:26 +0000 (GMT)
> From: dharsan sunday <dharsan21$##$yahoo.co.in>
> Subject: ORGLIST: LC-MS
> To: everybody$##$orglist.net
> Message-ID: <289161.39998.qm$##$web8508.mail.in.yahoo.com>
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>
> Dear all,
> pl clarify the below points about LC_MS .Thanks in advance
> 1.What is the difference between Positive and Negative mode and what we
found in it in LC-MS?
> 2.Can we find mass of the compund of unpure compound i.e 70% purity.
> 3.Is MS and LC-MS interpetation is same?
>
> Thanks in advance
>
> Regards,
> Dharsan
>
>
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> Message: 2
> Date: Wed, 8 Nov 2006 23:05:58 -0800 (PST)
> From: Kishore Babu Ch <kbchilukuri$##$yahoo.com>
> Subject: ORGLIST: hi
> To: everybody$##$orglist.net
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>
> hi everybody
>
> if any body suggest how to prepare bromination on
> 4-propyl pyridine i.e at CH2 position.i try with NBS
> and Bromine .but reaction not proceeded at cooling and
> RT and reflux temp under DCM condition
>
>
> bye
> ch.kishsore babu
>
>
>
>
>
>
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> ------------------------------
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> Message: 3
> Date: Fri, 10 Nov 2006 12:49:56 +0800
> From: "Peng Gao" <pgao00$##$st.lzu.edu.cn>
> Subject: ORGLIST: O-glycosylation
> To: everybody$##$orglist.net
> Message-ID: <363134196.16617$##$st.lzu.edu.cn>
> Content-Type: text/plain; charset="us-ascii"
>
> Dear all,
> Please see the attachment.What base should I use? I had tied all
kinds of
> base from literature, but all faild.
>
> Base:Cs2CO3, NaOH, t-BuOK, NaH, NaOMe, Ag2CO3(Koenig-Knorr
condition),
> Ag2O(Koenig-Knorr condition).
>
> The systems have no reaction or are very complex, I don¡¯t know why.
It¡¯s
> hard to repeat the reactions in the literature. It's too hard to
repeat!!!
>
>
> Why??????
>
> Any suggestion is welcome. Thanks.
>
>
>
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