SoCalChris06
I need help with organic chem
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Kryten
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can you please ask a question.
SoCalChris06
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how to form hemiacetal/acetals
SoCalChris06
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O H
R1-C-H + O-R2 ------->
.Sam.
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Reaction of carbonyl groups with alcohol,
SoCalChris06
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i need help getting what this means
.Sam.
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|dw:1351060446680:dw|
.Sam.
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What type of file is that? Is that .doc, docx, .pdf, .txt?
SoCalChris06
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not sure
im on my mac
.Sam.
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I can't open that, can you screenshot it?
SoCalChris06
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|dw:1351060784194:dw|
SoCalChris06
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this one was the aldehyde, alcohol and the last one is the hemiacetal
SoCalChris06
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r u still there?
SoCalChris06
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|dw:1351061659559:dw|
Classify this monosaccharide as an aldose or a ketoses?
.Sam.
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Its easy to look at it, that's aldose |dw:1351062443611:dw|
There's no ketone group found in this molecule.
SoCalChris06
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HOW ABOUT:.......
SoCalChris06
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|dw:1351062552815:dw|
.Sam.
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That's ketose because there's ketone group attached to it.
.Sam.
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|dw:1351062770074:dw|
SoCalChris06
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SO WHEN THE QUESTION IS ASKING CLASSIFY EACH OF THE FOLLOWING MONOSACCHARIDES AS AN ALDOSE OR A KETOSE ITS THAT SIMPLE?
SoCalChris06
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|dw:1351062942152:dw|
KETOSE?
.Sam.
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An aldose is a monosaccharide that contains only one aldehyde (-CH=O) group in a molecule. As for ketose, a ketose is a sugar containing one ketone group in a molecule.
.Sam.
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@SoCalChris06 that's ketose.
SoCalChris06
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|dw:1351063111146:dw|
KETOSE?
.Sam.
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ketose
SoCalChris06
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SO ALL OF THEM WERE KETOSE BUT THE FIRST ONE?
.Sam.
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yes
SoCalChris06
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AND THE O THAT WAS ATTATCHED IS THE INDICATOR?
.Sam.
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You do know that ketones are R-C(O)-R right?
.Sam.
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And aldehydes are R-COH
SoCalChris06
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YES
SoCalChris06
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BUT WHAT DOES THE R MEAN
.Sam.
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R groups are side chains, like Alchohol, Carbonyls (aldehydes and ketones), Carboxylic acid, Esters, Amines, Amides etc. Bonded to the molecule.
We'll take ketone for example,
|dw:1351063817237:dw|
Take Carboxylic acid (-COOH) and Amines (-NH2) bonded with our ketone, it will look like this:
|dw:1351063838534:dw|
SoCalChris06
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OH, SO ITS LIKE THE N OR X IN ALGEBRA
SoCalChris06
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THE UNKNOWN
.Sam.
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Yes, R can be replaced by those
SoCalChris06
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OH OK. I GOT IT
SoCalChris06
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I HAVE ANOTHER QUESTION FROM MY BOOK:
SoCalChris06
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THE INTERMOLECULAR REACTION THAT PRODUCES THE CYCLIC FORMS OF MONOSACCHARIDES INVOLVES FUNCTIONAL GROUPS ON WHICH 2 CARBON ATOMS IN THE CASE OF EACH OF THE FOLLOWING?
A.) D-GLUCOSE B.)D-GALACTOSE C.)D-FRUCTOSE D.) D-RIBOSE
.Sam.
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The only ketose group here is D-Fructose
SoCalChris06
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IS THAT WHAT ITS ASKING?
.Sam.
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Can you choose more than one?
SoCalChris06
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SoCalChris06
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I KNOW A IS ALPHA
B IS ALPHA
C IS BETA
AND I DONT KNOW WHICH D IS
.Sam.
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Its alpha , look:
|dw:1351065817816:dw|
.Sam.
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|dw:1351065913476:dw|
SoCalChris06
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SO ITS ON OPPOSITE ENDS?
SoCalChris06
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THE CH2OH AND OH, IS THAT WHAT YOURE LOOKING AT?
.Sam.
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The Anomeric carbon be side the oxygen is always the one who determines whether its alpha or beta
SoCalChris06
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WHAT DO U MEAN WHEN YOU SAY ANOMERIC
.Sam.
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SoCalChris06
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|dw:1351066163514:dw|
SO, THE WAY I WAS ABLE TO DETERMINE IF IT WAS A ALPHA OR BETA CAUSE IF IT WAS ON THE OPPOSITE SIDE, (DIFFERENT) SIDES, ITS AN ALPHA. IF ITS ON THE SAME SIDE:
|dw:1351066436831:dw|
SoCalChris06
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SO, SAME SIDE IS BETA
SoCalChris06
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THATS WHY THE LAST ONE THREW ME OFF
.Sam.
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No, look closely its like this|dw:1351066676182:dw|
You include the oxygen with the first carbon (or anomeric carbon), so for this one its beta.
SoCalChris06
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ITS BETA CAUSE THE CH2OH AND OH ARE ON THE SAME SIDE RIGHT?
.Sam.
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So, for the last one
|dw:1351066852933:dw|
is alpha
SoCalChris06
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|dw:1351066888242:dw|
CAUSE THEY ARE ON OPPOSITE SIDES?
.Sam.
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|dw:1351066975972:dw|
|dw:1351066986195:dw|
.Sam.
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The -OH determines whether its a alpha or beta, when -OH is on top, its beta, when -OH is on bottom, its alpha
SoCalChris06
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|dw:1351067070066:dw|
SO WHY WHEN U SWITCHED THEM DID THEY CHANGE?
SoCalChris06
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OHHHHHHHHHHHH!!!!!!!!!!!! LOL THAT MAKES SENSE...
SoCalChris06
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WILL YOU BE ON HERE TOMORROW?
SoCalChris06
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I NEED TO GET SOME REST. I NEED TO STUDY ALL DAY TOMORROW, BUT U HELPED ME WITH A FEW THINGS.
SoCalChris06
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ITD BE COOL IF U CAN GET ON TOMORROW, AT ABOUT 8AM LOS ANGELES TIME.
.Sam.
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Okay, I see whether if I'm free at that time.
SoCalChris06
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YEA, ILL BE ON HERE BETWEN 8:30AM TO LIKE 2PM LOS ANGELES TIME
SoCalChris06
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THANK YOU SO MUCH. I NEED TO PASS THIS TEST
.Sam.
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Welcome ;)